Thames & Kosmos Genetics & DNA Lab handleiding

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Thames & Kosmos

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Handleiding

Further

preparation for

isolating DNA

YOU WILL NEED

→ tomato-soap mixture from

Experiment 

→ test tube

→ test tube stand (folded from

die-cut cardboard sheet)

→ funnel

→ filter paper

→ ruler

→ permanent marker

3cm 3cm

Researchers often use a ﬁlter to get a clear

solution from a cloudy one. For the next

experiment, we will need a speciﬁc

quantity of liquid.

HERES HOW

1. Use the ruler to measure three

centimeters from the bottom of the test

tube, and mark that distance by drawing a

line with the permanent marker. Then, mark

another line three centimeters above that.

This will help us ﬁlter the right amount of

liquid.

2. Next, you will need a stand for the test tube.

Remove the test tube stand from its die-cut

cardboard sheet and fold it into the stand.

3. Set the test tube in one of the holes and

place the funnel in the test tube.

4. Fold the ﬁlter paper as shown in the

illustration below and insert it in the funnel.

If you run out of ﬁlter paper for later

experiments, you can just cut a regular

coffee ﬁlter so that it ﬁts into the funnel.

5. Gradually pour the tomato-soap mush (from

Experiment 1) in small portions onto the

ﬁlter. It will take a while for clear liquid to

fall, drop by drop, into the test tube.

6. Keep adding the mush until the liquid in the

test tube reaches the ﬁrst mark. It might

take up to ten minutes. Be patient.

TIP

On the topic of patience:

All scientists must be

patient. Some larger

experiments last for

weeks or months, and

sometimes they fail and

have to be repeated all

over again.

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EXPERIMENT 

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